How can we determine what is causing our vehicle not to start? on 2003 Ford Explorer

Periodically the car will not start. We have it towed to a service facility; they will keep it overnight; do diagnostic search and come up with no reason why it did not start.

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1 answer
COULD BE SEVERAL ISSUES NO REAL WAY TO TELL UNLESS IT HAPPENS WHILE ITS IN THERE CARE. DOES IT CRANK BUT NOT START OR NOTHING AT ALL